Topic summary: Criteria and constraints
One rule per lesson, in order, on one drawing. Then three easy questions.
The script (narration and what is on screen)
| # | Narration | On screen |
|---|---|---|
| 1 | Here's everything we found out about criteria and constraints. | Erin's tall holder and Luis's wide holder on the desk; Mr. Park's list card beside them |
| 2 | A criterion is a job the design must do, that anyone can test. | the list card with its first two lines marked; chip CRITERIA |
| 3 | A constraint is a limit on what you may use: the materials, the time, the money or the space. | the list card with its third line marked; chip CONSTRAINT |
| 4 | A test checks a criterion only when it does what the criterion says. | Luis's holder with ten pencils standing, three motion lines beside the desk leg; chip THE TEST |
| 5 | To compare two designs, give both the same test. | the two desks side by side, three motion lines beside each; chip HARD BUMP over each |
| 6 | A design solves the problem when every criterion is met and no constraint is broken. | the list card with a green tick beside each of its three lines |
| 7 | When a design fails, change the part that failed, and test it again the same way. | Erin's holder with its wider bottom, upright, three motion lines beside the desk leg; chip WIDER BOTTOM |
| 8 | Okay, now your turn. | the three attached questions appear |
Okay, now your turn
After the video · 1 of 3
A class is designing a lunch bag. Which sentence is a criterion?
After the video · 2 of 3
A paper hat must stay on in the wind, using only one sheet of newspaper. Three hats are tested. Which hat solves the problem?
After the video · 3 of 3
A cardboard ramp bends in the middle when a toy car rolls down it. What should happen next?